Getting data from a previous node

Hi all,
I’m trying to build some new nodes into Knime and I’m facing some difficulties. i want to get informations from a previous node (rows from a DataTable) and make it available in a configuration dialogPane for a following node(put extract values into a list for example). How can i do it? ( sorry for my English)
thanx a lot

You do not have access to the actual data from predecessing nodes in node dialogs but only to the tables structure via the DataTableSpec.